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                            # ALIAS

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alias用于設置當前數據表的別名，便于使用其他的連貫操作例如join方法等。

示例：

~~~
$Model = M('User');
$Model->alias('a')->join('__DEPT__ b ON b.user_id= a.id')->select();
~~~

最終生成的SQL語句類似于：

~~~
SELECT * FROM think_user a INNER JOIN think_dept b ON b.user_id= a.id
~~~

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